TW201326563A - Testing apparatus and testing method for fan - Google Patents

Abstract

A testing apparatus for a fan includes a duct air duct defining opposite inlet and outlet, and at least one anemometer mounted to an outlet of the air duct. The fan is received in the air duct to generate an airflow flowing in the air duct via the inlet and out of the air duct via the outlet. The at least one anemometer is used to measure a wind speed at the outlet.

Description

Fan test device and test method

The invention relates to a fan testing device and method.

Fans are widely used in electronic devices such as servers for heat dissipation. In order to ensure the cooling effect of the fan, the fan needs to be tested. Fan testing is usually done in the laboratory and wind tunnel equipment is used to measure the pressure-flow curve of the fan. Although the test method is accurate, the test period is long and special equipment is required. Therefore, the fan can only be sampled during the production process, and the whole test cannot be performed, so that there is a risk of missing defective products.

In view of the above, it is necessary to provide a fan test device and test method which are simple in operation and short in time.

A fan testing device for detecting a fan to be tested, the fan testing device comprising an air guiding cover with an opposite air inlet and an air outlet, and an at least one wind speed measuring device disposed at an air outlet of the air guiding cover The fan to be tested is received in the air hood and generates a wind flow flowing from the air inlet of the air hood to flow out from the air outlet, and the at least one wind speed measuring instrument is used to measure the wind speed at the air outlet of the air hood .

A test method for using the above-mentioned fan test device for detecting a fan to be tested, the test method comprising the steps of: installing a standard fan on the air hood; and opening the standard fan to generate a wind guide a wind flow flowing from the air outlet of the cover into the air outlet, measuring a wind speed Va at the air outlet of the air hood; taking out a standard fan and installing the fan to be tested on the air hood; opening the fan to be tested It generates a wind flow flowing from the air inlet of the air hood and flowing out from the air outlet, and measures the wind speed Vb at the air outlet of the air hood; comparing Va and Vb, if Vb is greater than or equal to Va, determining the waiting The test fan is qualified. If Vb is less than Va, it is determined that the fan to be tested is unqualified.

Compared with the prior art, the fan test device and the test method of the present invention measure the wind speed of the wind flow by measuring the standard fan and the fan to be tested under the same conditions, and then comparing the difference between the two can determine whether the fan to be tested is qualified, and the test process is simple. ,efficient.

Referring to FIG. 1, a preferred embodiment of the fan testing device of the present invention includes an air hood 10 and a three wind speed measuring device 30.

The air hood 10 has a rectangular parallelepiped shape, and includes a bottom wall 11, two side walls 13 extending vertically upward from opposite sides of the bottom wall 11, and a top wall 15 vertically connecting the tops of the two side walls 13. The size of the end faces of the air hood 10 is substantially equal to the fan to be tested. An air inlet 101 and an air outlet 102 are respectively disposed on both end faces of the air guiding cover 10 . The top wall 15 is provided with a pick-and-place port 151 adjacent to the air inlet 101 in a direction perpendicular to the two side walls 13. A guide rail 17 facing the access opening 151 is provided on the inner side of each side wall 13.

In the present embodiment, each wind speed measuring device 30 includes a probe 31 and a reader 33 electrically connected to the probe 31 through a cable. A probe 311 is provided at the front end of the probe 31. The probes 31 of the three wind speed measuring devices 30 are respectively fixed to the air guiding cover 10 and adjacent to the air outlet 102, and the three probes 311 are respectively located at the upper, middle and lower portions of the air guiding cover 10.

Referring to FIG. 2 and FIG. 3 together, a preferred embodiment of the fan testing method of the present invention includes the following steps:

S1: a standard fan 60 having the same specifications as the fan 70 to be tested and confirmed by the laboratory test is provided, and the standard fan 60 is slid from the pick-and-place port 151 of the air guiding cover 10 between the two guide rails 17, The standard fan 60 is thus mounted in the air duct 10.

S2: The standard fan 60 is turned on, and a PWM (Pulse Width Modulation) signal is input to the standard fan 60 to control the rotation speed thereof, so that the standard fan 60 generates an air inlet 101 from the air hood 10 from the air outlet. 102 outflow of wind. The wind speeds of the upper, middle and lower portions of the tuyere 102 are respectively measured by the three wind speed measuring instruments 30, and the average value Va thereof is calculated.

S3: The standard fan 60 is taken out from the pick-and-place port 151 of the air hood 10, and the fan 70 to be tested is slid between the two guide rails 17 from the pick-and-place port 151 of the air hood 10, thereby the fan to be tested. 70 is mounted in the air hood 10 .

S4: The fan 70 to be tested is turned on, and a PWM signal is input to the fan to be tested 70 to control the rotation speed thereof. The PWM signal input to the fan to be tested 70 is the same as the duty cycle of the PWM signal input to the standard fan 60. The fan to be tested 70 generates a wind flow that flows in from the air inlet 101 of the air duct 10 and flows out from the air outlet 102. The wind speeds of the upper, middle and lower portions of the tuyere 102 are respectively measured by the three wind speed measuring instruments 30, and the average value Vb thereof is calculated. Since the fan to be tested 70 is housed in the air guiding hood 10 and the end surface of the air guiding hood 10 is substantially equivalent in size to the fan 70 to be tested, the generated airflow completely flows through the air guiding hood 10. Therefore, in the case where the cross-sectional area of the air hood 10 is constant, if the measured average value Vb of the wind speed is larger, the heat dissipation effect of the fan is better.

S5: comparing Va and Vb;

S6: If Vb is greater than or equal to Va, it indicates that the heat dissipation effect of the fan 70 to be tested is better than that of the standard fan 60, thereby determining that the fan 70 to be tested is qualified;

S7: If Vb is less than Va, it indicates that the heat dissipation effect of the fan 70 to be tested is worse than that of the standard fan 60, thereby determining that the fan 70 to be tested is unqualified.

Another embodiment of the fan test method of the present invention detects that the fan 70 to be tested receives a higher duty cycle, such as 100%, and a lower duty cycle, such as 20% of the PWM signal is qualified, if both cases are qualified , the fan 70 to be tested is considered to be qualified. On the other hand, if the fan is not qualified in one case, the fan 70 to be tested is considered to be unqualified.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10. . . Wind shield

11. . . Bottom wall

101. . . Inlet

102. . . Air outlet

13. . . Side wall

15. . . Top wall

151. . . Pick and place

17. . . guide

30. . . Wind speed measuring instrument

31. . . Probe

311. . . Probe

33. . . Reader

60. . . Standard fan

70. . . Fan to be tested

1 is a perspective assembled view of a preferred embodiment of a fan testing device of the present invention.

2 is a view showing a state of use of the fan test device of FIG. 1.

3 is a flow chart of a preferred embodiment of the fan testing method of the present invention.

10. . . Wind shield

11. . . Bottom wall

101. . . Inlet

102. . . Air outlet

13. . . Side wall

15. . . Top wall

151. . . Pick and place

17. . . guide

30. . . Wind speed measuring instrument

31. . . Probe

311. . . Probe

33. . . Reader

60. . . Standard fan

70. . . Fan to be tested

Claims (8)

A fan testing device for detecting a fan to be tested, the fan testing device comprising an air guiding cover with an opposite air inlet and an air outlet, and at least one wind speed measuring device disposed at an air outlet of the air guiding cover. The fan to be tested is accommodated in the air hood and generates a wind flow flowing from the air inlet of the air hood and flowing out from the air outlet. The wind speed measuring instrument is used to measure the wind speed at the air outlet of the air hood. The fan test device of claim 1, wherein the air hood is provided with a pick-and-place port for inserting or removing the fan to be tested adjacent to the air inlet. The fan testing device of claim 2, wherein the inner wall of the air guiding hood is opposite to the two guiding rails of the access opening, so as to insert or take out the fan to be tested. The fan test apparatus of claim 1, wherein the wind speed measuring instrument comprises a probe, a reader, and a cable connected to the rear end of the probe and the reader, the front end of the probe A probe is provided. The fan test device of claim 4, wherein the three wind speed measuring instrument is respectively disposed on the upper, middle and lower portions of the air outlet of the air guiding hood. A test method for using a fan test apparatus according to claim 1, wherein the test method comprises the following steps:
Mounting a standard fan to the air hood;
Turning on the standard fan to generate a wind flow from the air inlet of the air hood and flowing out from the air outlet, and measuring the wind speed Va at the air outlet of the air hood;
Removing a standard fan and installing the fan to be tested on the air hood;
Turning on the fan to be tested to generate a wind flow flowing from the air inlet of the air hood and flowing out from the air outlet, and measuring the wind speed Vb at the air outlet of the air hood;
Comparing Va and Vb, if Vb is greater than or equal to Va, it is determined that the fan to be tested is qualified, and if Vb is less than Va, it is determined that the fan to be tested is unqualified. The test method of claim 6, wherein the air hood is provided with a pick-and-place port adjacent to the air inlet, and the inner wall of the air hood is provided with two opposite guide rails for the pick-and-place port. When a standard fan or a fan is to be tested, slide the standard fan or the fan to be tested from the access port of the air hood into the two guide rails. The test method of claim 6, wherein an air velocity measuring device is disposed on the upper, middle and lower portions of the air outlet of the air guiding hood, and Va and Vb are upper, middle and lower portions of the air outlet of the air guiding hood. The average of the wind speed.